Signal converter



FIG. 1 is a perspective view of the front, top and left side of a signal converter showing my new design;

FIG. 2 is a front view thereof, the rear being a mirror image;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line portion in the figure drawings is included to show unclaimed environment and forms no part of the claimed design. 

The ornamental design for a signal converter, as shown and described. 